How to get DS to understand 80+3 is not eleventy...

[ShowerOfMonsters]

Tearing my hair out here!
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Logically, eleventy would be 110 and 110+2 would be eleventy two.

I must admit I dug out my school calculator today. Probably the wrong thing to do, but the first time I ever heard him chuckling to himself whilst doing maths!

I would get him counting on in small numbers 1-10 where it isn’t onerous to count every cube. Once he has that concept move onto bigger numbers 10-20, 20-30. Until he can generalise this skill to any number. Don’t drop the easier numbers when you introduce the bigger ones. Make sure you keep a mix of sums he can do with sums he is learning how to calculate to keep his confidence and motivation up and to remind him of the simple rules.

I got www.amazon.co.uk/Non-brand-Montessori-Mathematics-Wooden-Learning/dp/B07GSR43FP/ref=sr_1_184?s=kids&keywords=wooden+numbers+for+children&tag=mumsnetforum-21&ie=UTF8&qid=1536862799&sr=1-184 wooden numbers which helped him visually see the number.

OP, I know that the school will mutter about the column method BUT he is reaching - or is in - the year group in which it is introduced (check the 2014 National Curriculum for his year group)

They will say his mathematical understanding isn't strong enough, but they can not really say that it's not age approproate if it is in his year's curriculum, and with the child i worked on it was a lightbulb moment because the comparison between the 'values' of the two things to be added was immediately clear and the answer easily arrived at.

Exchange in subtraction was sticky, but we got over that too....